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Dynamic range

About: Dynamic range is a research topic. Over the lifetime, 7576 publications have been published within this topic receiving 101739 citations. The topic is also known as: DNR & DR.


Papers
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Journal ArticleDOI
15 Jun 2005-Talanta
TL;DR: A novel inexpensive optical-sensing technique has been developed for colorimetric flow analysis that resulted in a linear response that obeys the Beer-Lambert law and the pK(a) of BCG was successfully determined.

60 citations

Proceedings ArticleDOI
15 Feb 2004
TL;DR: In this article, a 2-2 cascaded continuous-time sigma-delta modulator is proposed to achieve anti-alias suppression in the band from 150 to 170 MHz around the sampling frequency of 160 MHz.
Abstract: This paper presents the design of a 2-2 cascaded continuous-time sigma-delta modulator. The cascaded modulator comprises two stages with second-order continuous-time resonator loopfilters, 4-bit quantizers, and feedback digital-to-analog converters. The digital noise cancellation filter design is determined using continuous-time to discrete-time transformation of the sigma-delta loopfilter transfer functions. The required matching between the analog and digital filter coefficients is achieved by means of simple digital calibration of the noise cancellation filter. Measurement results of a 0.18-μm CMOS prototype chip demonstrate 67-dB dynamic range in a 10-MHz bandwidth at 8 times oversampling for a single continuous-time cascaded modulator. Two cascaded modulators in quadrature configuration provide 20-MHz aggregate bandwidth. Measured anti-alias suppression is over 50 dB for input signals in the band from 150 to 170 MHz around the sampling frequency of 160 MHz.

59 citations

Patent
30 Aug 2004
TL;DR: In this article, the authors presented an image processing method that provides discontinuity-preserving image smoothing and segmentation, noise reduction, reduction of image variations particularly those variations caused by illumination conditions, exposure compensation, and dynamic range compression.
Abstract: The present invention provides an image processing method. In one embodiment, the method provides discontinuity-preserving image smoothing and segmentation, noise reduction, reduction of image variations particularly those variations caused by illumination conditions, exposure compensation, and dynamic range compression. The present invention also provides an electronic image sensor that is able to detect high dynamic range optical images and produce electronic images with reduced dynamic range.

59 citations

Journal ArticleDOI
TL;DR: In this article, two CMOS image sensor circuit prototypes equipped with in situ frame storage have been fabricated and tested, which are intended for the capture of fast, brief, transient events with high resolution.
Abstract: Two CMOS image sensor circuit prototypes equipped with in situ frame storage have been fabricated and tested. Capable of 4-400 M-frames/s and between 66 and 79 dB rms dynamic range, these developments are intended for the capture of fast, brief, transient events with high resolution. Applications include accelerator-based flash radiography such as proton radiography. The first is a small two-dimensional (2-D) prototype in which each pixel includes either a capacitive trans-impedance amplifier or a direct-integration source-follower front end, followed by an array of 64 frame storage sample capacitors and associated readout electronics. The acquisition of either 32 frames using correlated double sampling (CDS) at 4 M-frames/s, or 64 frames without CDS at up to 10.5 M-frames/s (-3 dB), and up to 13 b dynamic range was achieved. The second is a monolithic solid state "streak camera", a 1-D linear array of 150 photodiodes, with a 150-frame analog storage array. This device reached 400-M-frames/s operation with electrical test inputs, at least 100-M-frames/s operation with optical inputs, and achieves over 11 b of dynamic range. These circuits demonstrate the high performance possible with CMOS sensor circuits containing in situ frame storage.

59 citations

Journal ArticleDOI
TL;DR: In this paper, a low-power microphone preamplifier with wide-band power-supply rejection is proposed, which employs a lowfrequency feedback loop to subtract the dc bias current of the microphone and prevent it from causing saturation.
Abstract: Bionic implants for the deaf require wide-dynamic-range low-power microphone preamplifiers with good wide-band rejection of the supply noise. Widely used low-cost implementations of such preamplifiers typically use the buffered voltage output of an electret capacitor with a built-in JFET source follower. We describe a design in which the JFET microphone buffer's output current, rather than its output voltage, is transduced via a sense-amplifier topology allowing good in-band power-supply rejection. The design employs a low-frequency feedback loop to subtract the dc bias current of the microphone and prevent it from causing saturation. Wide-band power-supply rejection is achieved by integrating a novel filter on all current-source biasing. Our design exhibits 80 dB of dynamic range with less than 5 /spl mu/V/sub rms/ of input noise while operating from a 2.8 V supply. The power consumption is 96 /spl mu/W which includes 60 /spl mu/W for the microphone built-in buffer. The in-band power-supply rejection ratio varies from 50 to 90 dB while out-of-band supply attenuation is greater than 60 dB until 25 MHz. Fabrication was done in a 1.5-/spl mu/m CMOS process with gain programmability for both microphone and auxiliary channel inputs.

59 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023176
2022383
2021189
2020265
2019325
2018334